Drawing press for heating and drawing sheet metal



July 19,1927. 1,636,111

F. J. RODE DRAWING PRESS FOR HEATING AND DRAWING SHEET METAL Filed Dec. 17, 1926 2 Sheets-Sheet l 1,636,111 July 19,1927. F J. RODE DRAWING PRESS FOR HEATING AND DRAWING SHEET METAL Filed Dec. 17, 1926 2 Sheets-Sheet 2.

Patented July 19, 1927.

UNITED STATES PATENT OFFICE.

IBE'DBICH J'. BOIDE, OF CHICAGO, ILLINOIS, ASSIGNOB TO MARQUETTE TOOL & MANIL- FACTURING COMPANY OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DRAWING PRESS FOB HEATING AND DRAWING SHEET Application fled December 17, 1926. Serial No. 155,394.

Heretofore in forming openings, such as window openings or work of this character, by drawingthe metal about the edge of a hole in a sheet metal blank, the metal cracks 'at the corners andin order to avoid this, it has been necessary to partially draw the opening, then the partially finished blank is removed from the machine and heated. The heated blank is then put back into the machine and the-draw is finished. The blank is removed and heated and placed back in the machine or press as often as necessary to completely finish the product. ations are not only tedious and laborious, but necessitate considerable time, resulting in an ezipensive production.

It is one of the objects of the present inventionto avoid all of these difficulties and objections and to embody in a press of this 2 character improved means whereby the blank-may be heated to the desired degree previous to or during the fprming or shaping operation, so that a draw of any desired extent or depth may be made without cracking or injuring the material or blank and without removing the blank from the machine after it has been placed therein until the blank has been completely drawn or shaped, regardless of the depth or extent of the draw to be made.

A further object is to provide in a machine of this character improved means whereby the heating means is movable toward and away from the work so that the die will not be subjected to undue heat, and

. improved means for limiting the movement of the heating means toward the work, such movements of the heating means being controlled b the movement of the reciprocating ram of t e press,

To the attainment of these ends and the accomplishment of other new and useful ob- 7 Such operparts in one other.

Figure 2 is a view similar to Figure 1, showing the parts in another position.

Referring more particularly to the drawings the numeral 10 designates generally the supporting structure of the press having a bed plate 11 upon which is mounted a die 12. Below the bed plate 11 and mounted upon suitable supports 13 are cushions 14 in which pistons (not shown) reciprocate, and connected with the pistons are piston rods 15.

These rods are connected by means of suitposition with respect to eachable connections 16 with a pressure pad or pin plate 17. 4

Pins 18 pass throu h the bed plate 11 and rest upon the plate 1%.

Supported by the pins 18 is a draw ring or blank holding member 19 which co-operates with a die member 20 for clamping the work 21 therebetween.

Fluid pressure is supplied to the cushions or cylinders 14 through a suitable pipe connection 22 leading from a source of supply of fluid pressure.

Mounted upon the press is a reciprocable member or ram 23 which has connected with it a member 24 preferably insulated therefrom by means of suitable heat insulation 25.

This member 24 is hollow or provided with a chamber 26 opening through the bottom thereof and is provided with an out let 27 to which is connected a suitable conduit 28 such as a flexible pipe or the like.

Depending from the member 24 are hangers 29 preferably in the form of rods or bolts, any number of which may be employed, and which are provided with threaded extremities 30 adapted to be threaded into the member 24.

The hanger members 29 may be of the required length accordin to the stroke of the ram with respect to t e die 12 and these members are also provided with threaded extremities 31 adapted to be threaded into the die member 20 for supporting the latter from the ram or movable member 23.

' Arranged beneath the member 24 and above the die 12 is a heater preferably in the .form of a manifold 32 having a plurality of jets or burners 33 connected therewith and directed toward the die 12 and preferably through the die member 20.

The burners 33 are supplied with fuel from the manifold which in turn is connected with a suitable source of fuel supply by means of a flexible pipe or conduit 34.

The burners andmanifold are supported preferably by means of a plate 35 through which the hanger members 29 ass and the hanger members are rovided with shoulders 36 upon which the p ate or member 35 rests (see F igure2) when the ram is ascending, so

as to raise the burners or heaters 33 during the upward movement'of the ram to move them away from the work.

' When the ram descends the plate or member 35, to ether with the burners or heaters 33 will a so be lowered until the burners and plate reach a predetermined position with respect-t0 the work supported by the die 12, at which time the downward movement of the plate 35 and the burners 33 will be arrested by means of shoulders 36 which are provided upon supports 37, the latter being preferably in the form of rods or uprights having their lower extremities 38 threaded into the bed plate 11 of the ma- 25 chine.

The shoulders 36 are formed by reducing a portion of the uprights or bars 37 as at 39 and the reduced portion 39 passes through suitable openings in the plate or member 35.

The shoulders 36 are arran ed at a predetermined distance above the ie 12 so that the die 20 will be adapted for a downward movement toward the die 12 independently of the burners or'heaters 33 and manifold 32.

If desired, a skirt may be provided and secured to the lower end of the member 24 to serve as a hood for directing the products of combustion from the burners or heaters 33 into the open chamber 26 of the member 40 24 from where they will be conveyed through the outlet 27 and pipe 28, away from the machine.

It is thought that the operation of this improved device will be clearly understood from the foregoing description, but briefly stated it is as follows.

When the ram 23 is elevated the fluid pressure in the cushions or cylinders 14 will preferably raise the draw ring or blank holder 19 so that the u per surface thereof will be aelevate'd above t e upper surface of the die 12, as shown in Figure 2.

The work 21 having an aperture 41 is then placed upon the blank holder19.

The ram 23 is then lowered until the die 20 contacts with the work, at which time the work 21 will be clamped or gripped between the die 20 and the blank holder 19.

A further lowering movement of the ram and of the die 20 will move the blank holder member 19 downwardly against the ressure of the cushions 14 until the work is brought into engagement with and-shaped over the die 12, as shown in Fi re 1.

05 During the descending movement of the ram from the position shown in Figure 2, the flame from the burners or heaters 33 will be directed against the work 21 to heat the latter so that when the work is formed over the die 12, the corners of the opening 41 will not be cracked. Y

The burners or heaters 33 will travel downwardly with the ram 23 until the plate or member 35 contacts with the shoulders 36. on the uprights 37. The plate or member 35 will then be arrested in its downward movement and the ram will continue downwardly independently with respect to the late or member 35.

I desired, suitable means ma be provided (not shown) whereby the ame from the burners or heaters 33 may be lowered when the downward movement of the plate or member 35 is arrested.

It will be manifest that with this construction and when the ram 23 rises the burners or heaters 33 will be moved away from the die 12 by the engagement of the shoulders 36 on the hanger members 29 with the plate or member 35 and this will not only prevent the burners from heating the die 12 to any undue extent, but will also move the flames away so as to provide ample space for the operator to insert the next blank in the machine without danger of becoming burned by the flame. I I

7 With this improved construction it will also be manifest that after the work has been once placed into the machine, the complete forming and operation thereon may be performed without necessitating a partial drawing of the work, and removal of the partially shaped work from the machine, so that it can be further heated, and the subsequent placing of the heated work back into the machine for a further operation'thereon.

In other words, with the present invention a complete operation and forming of the work may be done by a single stroke of the press.

While the preferred form of the invention has been herein shown and described, it is to be understood that various changes ma be made in the details of construction an in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is 1. A sheet metal drawing press embod' mg blank holding means, a reciprocabe member with which the blank holding means co-operates to grip the work, a burner assomated with the press for applying heat to the work, and means responsive to the operation of the ress for controlling the operation of the ame from the burner upon the work.

2. A sheet metal drawing press embodymg blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, cushioning means for resisting the movement of the blank holding means in one direction, a burner associated with a press for applying heat to the work within the press, and means whereby the amount of heat supplied from the burner to the work will be automatically controlled by the operation of the press.

3. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, and burners for applying heat to the work, said burners being movable towards and away from the w )rk, the said burners being responsive in such movements to the movements of the said reciprocable member.

4:. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, means for applying heat to the work and movable towards and away from the work, the said heat applying means being responsive in such movements to the movements of the said reciprocable member, and means for arresting the heating means in its movement towards the work to permit a predetermined degree of movement of the reciprocating member in a direction towards the work independent of the said heating means.

5. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means cooperates to grip the work, means associated with the press for applying heat to the work, an open chamber carried with a reciprocable member and disposed above the heating means for receiving the heated gases, and a discharge outlet leading from the chamber for conveying such gases away from the work and from the press.

6. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, heating means for the work. said heating means being movable with and with respect to the said recip- 'rocable member, and means for causing a relative movement of the reciprocating member and heater one with respect to the other at a predetermined time in the cycle of operation of the press.

7 A sheet metal drawing press embodying blank holding means, cushioning means for resisting the movement of the said blank holding means in one direction, a reciprocable member with which the blank holding means co-operates to grip the work, heating means for the work, said heating-means being movable with and with respect to the said reciprocable member, and means for causing a relative movement of the reciproeating member and heater one with respect to the other at a predetermined time in the cycle of operation ofthe press.

8. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means (o-operates to grip the work, a heater ar ranged in the press for heating the work thus gripped, and a conduit havin its inlet end arranged above the heater and in proximity thereto for receiving and carrying away excess heat.

9. A' sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank-holding means co-operates to grip the work, a'burner arranged above and adapted to direct a flame against the work, means supporting the burner for movement with and with respect to the said reciprocating member, and means for arresting the movement of the burner with the said reciprocating member at a predetermined time in the cycle of operation of the press to cause the reciprocating member to move independently with respect to the burner.

10. A sheet metal drawing press embod ing blank holding means, a reciprocab e member with which the blank holding means co-operates to grip the work, a burner within the press for directing a flame against the work for heating the latter, and means re sponsive in its operation to the movement of the said reciprocating member for controlling the extent of operation of the said flame upon the work.

11. A sheet metal drawing ing blank holding means, cus ioning means for the said blank holding means, a reoiprocable member with which the blank holding means co-operates to grip the work, a burner within the press for directing a flame against the work for heating the latter, and means responsive in its operation to the movement of the said reciprocating member for controlling the extent of operation of the said flame upon the work.

12. A sheet metal drawing press embodying blank holding means, fluid controlled cushioning means for the said blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, a burner within the press for directing a flame against the work for heating the latter, and means responsive in its op eration to the movement of' the said reciprocating member for controlling the extent of operation of the said flame upon the work.

13. A sheet metal drawing press embody ing blank holding means, a reciprocable member co-operating with the blank holding means for gripping the work, a support connected with the reciprocable member and movable therewith and with respect thereto, a burner carried by the support, and a stop 1press embodying blank holdin arranged in the path of movement of the said support with the reciprocable member to arrest the movement of the support and burner and to permit'the said reciprocable member to continue in its movement independently of the said support.

'14. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, cushioning means for the said blank holding means, a support connected with the said reciprocable member'for movement therewith and with respect thereto, a: burner carried by the support, a stop for arresting the movement of the said support and burner in a direction towards the work at a predetermined time in the cycle of operation of the press to permit the said reciprocable member to continue in its movement towardthe work independently of the said support, and means for moving the support and burner in a direction away from the work as the reciprocable member moves in a direction away from the work.

15. A sheet metal drawing press embodying blank holding means, a reciprocable member with which the blank holding means co-operates to grip the work, a supporting member movable with and with respect to the reciprocating member, fixed uprights mounted upon a stationary part of the press for loosely' guiding the said supporting member' for up and down movements, shoulders on the uprights for arresting the movement of the supportim member to permit the reci roca-ting member to move independently with respect thereto and in a direction toward the work, and a burner supported by said supporting member for ireeting a flame against the work.

16. A sheet metal drawinglpress embody' means, a reeiproca'tin ram, a die mem r disposed below an spaced from the ram, hanger members for.

connecting the die member with the ram,

of December,

said blank holding means co-operating with the die member to grip the work, a support loosely mounted upon the said hanger members intermediate the ram and die member and adapted for movement with and with respect to the said die member, a burner mounted upon the said support for directing a flame against the work, up ri ht guides mounted upon a fixed portion 0 the press for guiding said support, and shoulders on the guides beneath the support for arresting the support in its movement with the said die member towards the work, whereby the die member will be permitted to move towards the work independently with respect to the said die member.

17. A sheet metal drawing press embodying blank holding means, cushioning means for the said blank holding means, a reciprocating ram, 21 die member disposed below and spaced from the ram, hanger members for connecting the die member with the ram,

- said blank holding means co-operating with the die member to grip the work, a support loosely mounted upon the said hanger members intermediate the ram and die member and adapted for movement with and with respect to the said die member, a burner mounted upon the said su port for directing a flame against the wor upright guides mounted upon a fixed portion of the press for guiding said support, shoulders on the guides beneath the support for arresting the support in, its movement with the said die member towards the work, whereby the die member will be permitted to move towards the work independently with respect to the said die member, and an exhaust passage having its inlet above and adjacent the burner for conveying away excess heat.

In testimony whereof I have signed my name to this specification, on this 7th day D. 1926.

FREDRICH J. RODE. 

